Telephone-receiver.



W. KAISLING.

TELEPHONE'REGEIVER.

APPLICATION IILBD 11:13.19, 1903.

PATENTED FEB. 2l, 1905.

IIIVEIITDI.

I William Kaillng EH v Amm-eg No. 783,283. Patented February 21, 1905.

UNTTBD STATES PATENT VILLIAM KAISLING, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE STROM- BERG-CARLSON TELEPHONE MANUFACTURING COMPANY, OF ROCH- ESTER, NEW YORK, A CORPORATION OF NEW YORK.

TELEPHONE-RECEIVER.

SPECIFICATION forming part of Letters Patent No. 783,283, dated February 21, 1905.

' 'Application ned February 19, 190s. semi No. 144,087.

To all whom, it mfr/ 7j concern: Furthermore my invention nnovidns n relBe it known that I, IILLIAM KAIsLING, a ceiver of great simplicity of construction and 50 citizen of the United States, residing at Chiof improved durability and mechanical and cago, in the county of Cook and State of Illielectrical efficiency.

nois, have invented a certain new and useful My invention will be readily understood by Improvement 1n Telephone Receivers, of reference to the accompanying' draw1ngs,l1n which the following 1s a full, clear, concise, and which- 5 5 exact description, reference being had to the Figure 1 is a perspective View illustrating accompanying drawings, forming a part of the preferred embodiment of my invention.

1o this specification. Fig. 2 is a central longitudinal cross-sectional My invention relates to telephone-receivers, view of the same. Fig. 3 is a cross-sectional and particularly to the means for adjusting view taken on line 3 3 of Fig. Q. Fig. I is a 6o therelativedispositionbetween-thediaphragm view of a locking member employed' in the and the electromagnet-cores of such receivers. preferred embodiment of my invention. Fig.

In telephone-receivers it is desirable that 5 is a cross-sectional view taken on line 5 5 of means he provided whereby the distance be- Fig. 2. tween the diaphragm and the ends of the elec- I have illustrated a receiver-case compris- 5 tromagnet-poles may be adjusted. It is also ing a hand portion 1 and an earpiece 2, both l desirable that the adjustmentV when once perpreferably formed of hard rubber. The infected shall be accurately and absolutely mainterior of the hand portion is hollow to receive tained. The expansion of different materials the permanent horseshoe-magnet 3. To this due to changes in temperature varies. In horseshoe permanent magnet are fastened, by 7o order that the expansion and contraction bemeans of the screw 4, the soft-iron cores 5 and tween the electromagnet-poles and the dia- 6, upon which are wound electromagnet-coils phragm be uniform, it has been found desir- 7 and 8, retained between spool ends 9 and 10. able to make the adjustable and adjusting There is clamped between the soft-iron cores parts of telephone-receivers entirely of metal, a screw threaded adjustingpiece ll of H- 75 as distinguished from receivers of the prior shaped cross-section. A thin disk I2 is interart, in which hard rubber or other suitable posed between the adjusting-piece 11 and the insulating material has formed a part of tho electromagnet-coils to form a partition bemeans of support intervening between the tween the chamber containing theelectromagdiaphragm and the electromagnet poles. net-coils and that containing the horseshoe 8o There has heretofore been aserious objection permanent magnet. The parts 11 and I2 are to such receivers provided with metallic adpreferably formed of brass or other non-mag- 3 5 justable parts in that such parts have been netic material. The adjusting-piece 11 is exposed on the outside of the receiver. If screw-threaded into the cylindrical portion 13 for any reason an electrical connection is estabof a bell-shaped diaphragm-supporter 14, to 8 5 lished between the telephonie circuits and the the face 15 of which the diaphragm I6 is metal parts of the telephone-receiver, a perclamped, as will hereinafter be more fully ex- 40 son in using such a receiver has been Lmore or plained. The exterior of the cylindrical porless liable to lelectrical shocks, which sometion 13 of the diaphragni-supporter is screwtimes have been of a serious nature. threaded within the handle portion 1, as shown It is the object of my invention to provide at 17. A shoulder I8 upon the diaphragma telephone-receiver in which the adjusting supporter rests upon ashoulder 19 of the han- 45 and adjustable parts shall be entirely of metal dle portion 1 to maintain a permanent relaand which atl the same time shall be entirely tive disposition between the handle portion covered and protected by suitable insulating and thediaphragm-supporter. Thediaphragm material. is held in contact with the face 15 of the diaphragm-supporter by means of the shoulder of the earpiece 2, the earpiece being' screwthreaded over the iianged end of the bellformed of brass or other non-magnetic metal,

and the shoulder of the earpiece. The parts are so proportioned that the edge of the earpiece projects over the edge 22 of the handle portion 1, whereby the metal parts of the re-v ceiver are entirely incased and inclosed by the hard-rubber casing. In order that the electromagnet-poles may be adjustable with respect to the diaphragm, the adjusting-piece 11 is screw-threaded within the cylindrical portion 13 of the diaphragm-supporter. By removing the diaphragmsupporter and the other metal parts of the transmitter from the hard-rubber casing the diaphragni-supporter and the adjusting-piece 11 may be relatively rotated to adjust the distance between the electromagnet-poles and the diaphragm.. In order to lock the parts in position as adjusted, the H-shaped locking-piece 23 is provided. This locking-piece is slightly longer than the width of the ad justing-piece 11, and its circular ends overlap the rear edge of the cylindrical portion 13. This edge extends slightly beyond the rear end of the adjusting-piece 11, and when proper adjustment is obtained between the ad justing-piece and the cylindrical portion 13 to bring the pole-faces in the proper position before the diaphragm the screws 24, which before adjustment have been loosened, are turned to draw the locking-piece toward the adjusting-piece 11. As the ends of this locking-piece, however, engage the rear edge of the cylindrical portion 13 the tendency will be to produce great friction between the threads of the adjusting-piece and the diaphragm-supporter, and these two parts will therefore be locked against movement until the screws 24 are again loosened for further adjustment. Openings are provided through the disk 12, the adjusting-piece 11, and the locking-piece 23 to accommodate the conductors25, leading from the electromagnet-coils to the insulated terminals 26, which are clamped to the permanent magnet, as shown, and to which the conductors of a receiver-cord may be attached.

It will thus be seen that my invention provides means whereby the common-means of support for the diaphragm and the electromagnet-cores is entirely of meta'l. This prevents any relative movement between the electromagnet-cores and the diaphragm due to variations in the temperature of the receiver. Furthermore, I have provided means whereby the metallic parts of the receiver are entirely inclosed within a receiver-casing of hard rubber, whereby a receiver of neat and pleasing appearance is provided and at the same time one whose mechanical and electrical eciency is superior to that of receivers of the prior art.

While I have herein shown and described the preferred embodiment of my invention and one modification thereof, it will be apparent that many modifications might equally well be ernployed. I do not, therefore, wish to limit myself tothe precisey disclosure herein Iset forth; but,

Having described my invention, I claim as new and desire to secure by Letters Patent- 1. In a telephone-receiver, the combination with a diaphragm, of a metal diaphragm-supporting' member, an adjusting member 1 1 screw-threaded to the lower end of said-supporting member whereby said members may be relatively adjusted, a magnet supported by said adjusting member, and a locking member 23 connected with the lower end of said adjusting member and engaging said supporting member whereby said members are locked in adjustment, substantially as described.

2. In a telephone-receiver, the combination with a diaphragm, of a metal diaphragm-supporting member, an earpiece of insulating material having' screw-threaded engagement with said diaphragm -supporting member whereby said diaphragm is retained in contact with the face of said supporting member, an adjusting member 11 screw-threaded into the lower end of said supporting member, whereby said members may be relatively adjusted, a magnet supported by said adjusting member, and a locking member 23 connected with the lower end of said adjusting member and engaging saidsupporting member whereby said members are locked in adjustment, substantially' as described.

IOO

3. In a telephone-receiver, the combination i with a diaphragm, of a metal diaphragm-supporting member, an adjusting member l1 screw-threaded to the lower end of said supporting member whereby said members may be relatively adjusted, a magnet supported by said adjusting member, a locking member 23 connected with the lower end of said adjusting member and engaging said supporting member whereby said members are locked in adjustment, and an inclosing casing of insulating material entirely surrounding said members and said magnet, substantially as described.

4. In a telephone-receiver,,the combination with a diaphragm, of a metal diaphragm-sup- IIO porting member, an earpiece of insulating material hav-ing screw-threaded engagement with said diaphragm supporting member whereby said diaphragm is retained in contact with the face of said supporting member, an adjusting member 11 screw-threaded into the lower end of said supporting member, whereby said members may be relatively adjusted, a magnet supported by said adjusting member, a locking member 23 connected with the lower end of said adjusting member and engaging saidsupporting member, whereby said members are locked in adjustment, and a han- *Isaacs dle portion of insulating material forming with said earpiece a casing which entirely incloses the metal parts of said receiver, said handle having screw-threaded engagement with the outside of the lower end of said diaphragm-supporting member, substantially as described.

5. In a telephone-receiver, the combination with apermanent horseshoe-magnet, of cores attached to the poles thereof, electromagnetcoils on said cores, a screw-threaded adjusting member l1 attached to said cores and said magnet, a diaphragm supporting member threading at its lower end over said adjusting member. a locking member 23 engaging the lower end of said diaphragm-supporting member and connected with said adjusting member for locking said members after adjustment thereof, an earpiece of insulating material having screw-threaded engagement with said diaphragm-supporting member, a diaphragm clamped between said earpiece and said supporting member, and a handle portion of insulating' material extending from said earpiece and entirely surrounding said adjusting member and said magnet, said handle portion having screw-threaded engagement with the outside of the lower end ot' the diaphragm-supporting member, substantially as described.

6. 1n a telephone-receiver, the combination witha diaphragm, of a metal diaphragm-supporting member, an adjusting member ll screw-threaded into the lower end of said supporting member, whereby said membersmay be relatively adjusted, a magnet supported by said adjusting member, a locking member 23 engaging at its edge with the lower end of the supporting member, and screws connecting the central portion of the locking member with the adjusting member, tightening of said screws causing said adjusting member to be locked with respect to the supporting member.

In Witness whereof I hereunto subscribe my name this 16th day of February, A. D. 1903.

WILLIAM KAISLING.

Witnesses:

CHARLES A. BROWN, CHARLus J. SCHMIDT. 

